This is a small (5 x 8) bathroom; everything will be updated (tub, toilet, sink, floor, window, fan, tile in tub area, wainscoting elsewhere). No structural changes. Probably the only thing semi-unusual is that I'll need a dedicated breaker for the tub (which will have the "hot soak" feature).

I will provide everything except basic construction materials and will have everything on site and ready to go. This is really a labor-only estimate. I'm in Sacramento.

I thank you in advance for your help. I know that illegals are driving prices crazy here in CA, but all my bids were from licensed folks, and still a huge discrepancy. What would be a fair labor range? ...I've already tried the online estimators...they're useless.

So are we. The cost of the job depends on many variables, none of which are being told to us, and even if they were we could not come up with a price without seeing it. It would be a rare plumber who would do a job like this for labor only, (unless it is on an hourly basis and then it is whatever he charges per hour), unless there was a large fudge factor to cover the time lost when you DO NOT have the necessary fitting and things bog down while you go get it. I did a job like this for an out of town friend and had several times when we had to wait while he went 20 miles away to get an item and sometimes he brought back the wrong one.

Providing all the material, you also take on all the future warranty responsibilities, and you also relieve the plumber of responsibility if he has to charge extra to "fix" or "replace missing parts" in your provided items. If you hang around these forums, you are probably aware of the relatively high out-of-box failures on items from blue or orange.

All that said, it is not unusual to have widely discrepant bids at this point. Some guys will bid high if they think the hassle-factor will be high. Some bid low if they need some work to keep a crew busy right now. Have the bids been based on a close on-site look-see at the job, or are they based on a quick phone call?

Check some references. Don't put too much money up front. Especially in your case where there is little material for the contract. Here in CA, a contractor can only ask for 10% of the contract, or $1000, whichever is LESS up front. Then of course, he is entitled to progress payments and payment for material deliveries. If a guy wants all his money up front, it may not be legal, and may be a sign that he needs YOUR money to finish the last job he is working on. Very tenuous situation.

I would have thought that contractors would be glad to not have to shop. I'm not talking about construction materials...if I knew what to get I wouldn't need a contractor, would I?

It doesn't instill a lot of confidence when bids on such a small room vary by 10K. I can see why people say *%@ it, I'll just take the lowest bid. When you don't have anything to go by, when there are no rules of thumb, seems impossible to make a decision based on anything but price. I liked all 3 of the folks who bid on the job.

If your bids are divergent by 50% or more....well it can happen , but I might also ask myself if they are all bidding on the same thing. If there is wiggle room in your written or oral specs, then the bids will also be wiggly.

An out of state contractor bid on a high rise in this area a long time ago. He bid super low, at cost, planning to make his profit on the extras and change orders. The owner gave him ZERO extras and change orders, and the contractor lost his shirt on that job.